class Vehicle:
    def __init__(self, brand):
        self.brand = brand

    def start(self):
        print(f"{self.brand}启动")

class Car(Vehicle):
    def __init__(self, brand, seats):
        super().__init__(brand)
        self.seats = seats

    def start(self):
        print(f"汽车{self.brand}启动")

class Swimmer:
    def swim(self):
        print(f"在水面行驶")

class AmphibiousCar(Car, Swimmer):
    def __init__(self, brand, seats):
        super().__init__(brand, seats)

    def float_on_water(self):
        print(f"{self.brand}漂浮在水面上")

# 创建AmphibiousCar对象并调用方法
amphibious_car = AmphibiousCar("SeaCar", 4)
amphibious_car.start()      # 输出：汽车SeaCar启动
amphibious_car.swim()       # 输出：在水面行驶
amphibious_car.float_on_water()  # 输出：SeaCar漂浮在水面上    